# A150089 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 19 4 66 5 243 6 930 7 3677 8 14893 9 61580 10 258798 11 1103083 12 4757383 13 20729422 14 91130929 15 403776628 16 1801448724 17 8086934285 18 36504894978 19 165610128497 20 754727631760 21 3453706751619 22 15864249216608 23 73123710278400 24 338129830741337 25 1568159784767825 26 7292647519656839 27 34000453643498153